MLM source codes for php and asp.net

I'm looking for MLM modules which I can integated to websites coded with PHP or ASP.NET(C#)
Anyone knows free or reasonable and simple MLM packages with source codes?
The website is already created and user information (login, profile information) is already in its database.
MLM software needs to be programmable in source level to integrate user session between the existing website and the softwware.

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